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#include <QtGui>

#include "diagramitem.hpp"
#include "arrow.hpp"
#include "QDebug"

//! [0]
DiagramItem::DiagramItem(DiagramType diagramType, QString text, int width, int height, int x, int y, QGraphicsItem *parent, QGraphicsScene *scene)
    : QGraphicsPolygonItem(parent, scene)
{
    myDiagramType = diagramType;
    diagramTextItem = new DiagramTextItem(this, scene);
    diagramTextItem->setPlainText(text);
    QTextCursor tc = diagramTextItem->textCursor();
    QTextBlockFormat tbf = QTextBlockFormat();
    tbf.setAlignment(Qt::AlignCenter);
    tc.setBlockFormat(tbf);
    diagramTextItem->setTextCursor(tc);
    diagramTextItem->setTextWidth(width);
    this->setPos(x, y);

    QPainterPath path;
    switch (myDiagramType) {
        case StartEnd:
	    path.moveTo(width*3/4, -height/2);
	    path.arcTo(width*1/4, -height, width/2, height/2, 0, 90);
	    path.arcTo(-width*3/4, -height, width/2, height/2, 90, 90);
	    path.arcTo(-width*3/4, -height/2, width/2, height/2, 180, 90);
	    path.arcTo(width*1/4, -height/2, width/2, height/2, 270, 90);
	    path.lineTo(width*3/4, -height*3/4);
	    /*path.moveTo(75, -50);
	    path.arcTo(25, -100, 50, 50, 0, 90);
	    path.arcTo(-75, -100, 50, 50, 90, 90);
	    path.arcTo(-75, -50, 50, 50, 180, 90);
	    path.arcTo(25, -50, 50, 50, 270, 90);
	    path.lineTo(75, -75);*/
	    myPolygon = path.toFillPolygon();
	    diagramTextItem->setPos(x - (width/2), y - (height/2) - 10);
	    break;
        case Conditional:
	    myPolygon << QPointF(-width/2, 0) << QPointF(0, height/2)
		      << QPointF(width/2, 0) << QPointF(0, -height/2)
		      << QPointF(-width/2, 0);
	    diagramTextItem->setPos(-width/2, -10);
            break;
        case Step:
	    myPolygon << QPointF(-width/2, -height/2) << QPointF(width/2, -height/2)
		      << QPointF(width/2, height/2) << QPointF(-width/2, height/2)
		      << QPointF(-width/2, -height/2);
	     diagramTextItem->setPos(-width/2, -10);
            break;
	case Label:
	    diagramTextItem->setPos(-width/2, -10);
	    break;
        default:
            myPolygon << QPointF(-120, -80) << QPointF(-70, 80)
                      << QPointF(120, 80) << QPointF(70, -80)
                      << QPointF(-120, -80);
	    diagramTextItem->setPos(-width/2, -10);
            break;
    }
    setPolygon(myPolygon);
    setFlag(QGraphicsItem::ItemIsMovable, true);
    setFlag(QGraphicsItem::ItemIsSelectable, true);
}
//! [0]

//! [1]
void DiagramItem::removeArrow(Arrow *arrow)
{
    int index = arrows.indexOf(arrow);

    if (index != -1)
        arrows.removeAt(index);
}
//! [1]

//! [2]
void DiagramItem::removeArrows()
{
    foreach (Arrow *arrow, arrows) {
        arrow->startItem()->removeArrow(arrow);
        arrow->endItem()->removeArrow(arrow);
        scene()->removeItem(arrow);
        delete arrow;
    }
}
//! [2]

//! [3]
bool DiagramItem::containsArrow(Arrow *arrow)
{
    for(int i = 0; i < arrows.size(); i++)
    {
	if(arrows.at(i)->equal(arrow))
	{
	    return true;
	}
    }
    return false;
}

DiagramTextItem *DiagramItem::getDiagramTextItem() const
{
    return diagramTextItem;
}

void DiagramItem::addPreviousItem(DiagramItem *previousItem)
{
    previousItems.append(previousItem);
}

void DiagramItem::addArrow(Arrow *arrow)
{
    arrows.append(arrow);
}
//! [3]

//! [4]
QPixmap DiagramItem::image() const
{
    QPixmap pixmap(250, 250);
    pixmap.fill(Qt::transparent);
    QPainter painter(&pixmap);
    painter.setPen(QPen(Qt::black, 8));
    painter.translate(125, 125);
    painter.drawPolyline(myPolygon);

    return pixmap;
}
//! [4]

//! [5]
//! [5]

//! [6]
QVariant DiagramItem::itemChange(GraphicsItemChange change,
                     const QVariant &value)
{
    if (change == QGraphicsItem::ItemPositionChange) {
        foreach (Arrow *arrow, arrows) {
            arrow->updatePosition();
        }
    }

    return value;
}
//! [6]
